These mounts are designed for a 1983-1991 E30 BMW 3-series with an M10 engine. Revshift motor mounts are made by Revshift in the U.S.A. from high quality polyurethane.Revshift mounts are the most durable and reliable mounts on the market. High tensile strength flanged studs are embedded deep in the urethane which prevent the isolated ends from separating under extreme loads. Utilizing class 12.9 alloy steel fasteners these mounts will hold your engine in place for a lifetime. The class 12.9 fasteners are approximately 75 percent stronger than the fasteners used on stock automotive mounts.Sold as a pairLifetime warranty Hardness80A Street (Black): Stiffer and stronger than OEM rubber. Minimal increase in NVH. Great choice as an upgrade over stock mounts (OEM+).95A Track (Green): Significantly stiffer and stronger than OEM rubber. Noticeable increase in NVH. Excellent for enthusiastically driven street and track cars.75D Drift (Teal): Drastically stiffer and stronger than OEM rubber. Moderate increase in NVH. Most commonly used on dedicated drift and track cars.(NVH = noise, vibration, harmonics)Learn more about choosing polyurethane here: https://revshift.com/pages/polyurethane Please specify the hardness
